/Engine/Plugins/Experimental/LandscapePatch/Source/LandscapePatch/Public/LandscapeTexturePatch.h
Set the patch coverage (see GetUnscaledCoverage for description).
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=LandscapePatch) virtual void SetUnscaledCoverage ( FVector2D Coverage )